About: http://webisa.webdatacommons.org/439318834

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Now, you must check whether it is a minimum or maximum: just take the determinant of the Hessian and you will get $(200/a^3)^2-81 = 18^2 - 81 > 0$ and so this is a local minimum.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com